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problem with spectreRF

abouzied

I have the following question:

If I do iip3 simulation for an LNA and after choosing the output, the iip3 is -3dBm for example.

If I choose the net of the input as the output for iip3 calculation, it will be -3dBm(ideally it should be infinity), Why does this happen ?

I use PSS followed by PAC for simulation.

thanks in advance,

Mohamed Abouzied

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  • mabouzied

    Dear Andrew,

    Thanks again. I checked the documents of the LNA. When I saw the IIP3 curves, the input power is started at the x-axis from -40dBm in order not to show the previous problem. But I think it still exists. About tightening the tolerance, I use conservative and further I go to analog sisimulator options and tighten all the tolreances by a factor of 1000. But the problem exists.

    Best Regards,

    Mohamed

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  • mabouzied

    Dear Andrew,

    Thanks again. I checked the documents of the LNA. When I saw the IIP3 curves, the input power is started at the x-axis from -40dBm in order not to show the previous problem. But I think it still exists. About tightening the tolerance, I use conservative and further I go to analog sisimulator options and tighten all the tolreances by a factor of 1000. But the problem exists.

    Best Regards,

    Mohamed

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